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Acquisitions Acquisitions Pro-Forma Operating Results (Tables)
 12 Months Ended
Jul. 31, 2015
Precision Dynamics Corporation [Member]  
Business Acquisition [Line Items]  
Pro Forma Information
 
 
2013
Net sales, as reported
 
$
1,157,792

Net sales, pro forma
 
1,226,217

(Loss) earnings from continuing operations, as reported
 
(138,257
)
(Loss) earnings from continuing operations, pro forma
 
(133,957
)
Basic (loss) earnings from continuing operations per Class A Common Share, as reported
 
(2.70
)
Basic (loss) earnings from continuing operations per Class A Common Share, pro forma
 
(2.61
)
Diluted (loss) earnings from continuing operations per Class A Common Share, as reported
 
(2.70
)
Diluted (loss) earnings from continuing operations per Class A Common Share, pro forma
 
(2.61
)